Loud speaker



Ma y ZG, 1931. w. D. PACK 1,807,168

LOUD SPEAKER Filed Dec. 14 925 2 Sheets-Sheet l V ATTORNEYJ W. D. PACK LOUD SPEAKER May 26, 1 931. I

Filed Dec. 14. 192 2 Sheets-Sheet 2 Patented May 26, 1931 UNITED STATES PATENT OFFICE WEHRLI D. PACK, OF SALT LAKE CITY, UTAH, ASSIGNOR TO UTAH RADIO PRODUCTS COMPANY, INCORPORATED, A CORPORATION OF UTAH LOUD SPEAKER Application filed December 14, 1926. Serial No. 154,716.

This invention relates primarily to that particular type of loud speaker known as a cone loud speaker; the cone being securely and solely mounted upon a member of the speaker unit which is caused to vibrate by the armature mounted in the magnet coil of said speaker unit.

The object of this invention is to produce a cone loud speaker having its cone securely mounted at its apex upon a member of the speaker unit.

Another object of this invention is to produce a cone loud speaker having a. speaker unit to which is fastened a member which is given a reciprocating motion by the vibratory action of the armature mounted in the magnet coil of said unit.

Another object of this invention is to produce a cone loud speaker, the cone of which is reinforced at its periphery and mounted at its apex upon a reciprocating member of the speaker unit; the reciprocating motion of said member being imparted to said cone causing its surface to vibrate, thereby creating sound waves.

A further object of this invention is to produce a cone loud speaker which can be inexpensively manufactured and which will give full tone qualities due to the method of mounting and the reinforced periphery of the cone, said reinforced periphery preventing the wall of the cone from warping, thereby eliminating distortion due to improper vibration.

With these and other objects in view, to be more fully set forth hereinafter,the invention consists in the novel construction, combination of elements and arrangement of parts which will be exemplified in the operation and construction herein described in the following specification and illustrated in the accompanying drawings.

The disclosure made the basis of exemplifying the present inventive concept suggests a practical embodiment thereof, but the invention is not to be restricted to the exact details of this disclosure, and the latter, therefore, is to be understood from an illustrative rather than a restrictive standpoint.

The invention will first be described in connection with the accompanying drawings, wherein similar reference characters are used to designate corresponding parts throughout the several views, and more specifically defined and indicated in the appended claims.-

The inventive idea involved is capable of receiving a variety of mechanical expressions, one of which, for the purpose of illustration is shown in the accompanying drawings, in which Fig. 1 illustrates a rear View of my improved cone loud speaker;

Fig. 2 is a side View of same illustrating the method of mounting the cone and speaker unit;

Fig. 3 is a full sized side view of the speaker unit with a fragment of the cone in section;

Fig. 4 illustrates the speaker unit with part of magnet housing cut away;

Fig. 5 is a central sectional view of same;

Fig. 6 is a side view of the speaker unit with part of the housing cut away;

Fig. 7 is a front view of the speaker unit; and

Fig. 8 is a rear view of the member upon which the cone is secured and which is given a reciprocating motion by the armature mounted in the magnet coil.

Referring to the drawings, numeral 1 represents a support having integraltherewith as its upper end the supporting ring 2 to which is securely fastened the speaker unit 3 by means of the screws 4:. The speaker unit comprises mainly the ring 5 (see Figures 4, 5 and 6) which is drilled and tapped to receive the screws 4, the permanent magnet 6 held in position by the bolts 7, the

heads of which are received by countersunk holes in said ring 5, the magnet pole pieces 8 between which is securely held the energizing coil 9, each of said pole pieces being in contact with one of the poles of said magnet, and the armature 10 which is centrally supported in the coil 9, its ends extending V outward between the ends of the pole pieces 9. The pole pieces 9 are also supported by the bolts 7 and likewise the fibre terminal support 11 to which is attached the lead wires 12 coming from the source of energy, and the coil leads 13. The washers 14 also carried in the bolts 7 and on the opposite side of the magnet poles to that of the pole pieces are introduced to balance up the magnet structure.

Attached to one end of the armature 10 which extends beyond the ends of the pole pieces is the driving rod or connecting 15. The outwardly extending end of the driving rod or connecting link is connected to the inner ends of the radially extending supports 16 by the solder 17 said supports 16 being held in position by the screws 4 at their outer ends against the face of the supporting ring 2. Integral with the supports 16 and extending outward at right angles thereto are the extensions or legs 18 to which is fastened by soldering or any othersuitable means, the, conical support 19 for the paper cone 20. Centrally located in the support 19. is the screw 21 which is prevented from turning by means of solder. The cone is held in position (see Figures'2 and 3) by passing it over the screw 21, a small hole being provided in its apex for this purpose and then forcing the conical clamp 22 up against its outer surface by means of the nut 28. The periphery .of the cone is reinforced by the wire ring 24 which is held in position by the paper band 25. e

The magnet and the coil are protected by the housing 26 which is held in position on the ring 5 by the screws 27, said housing having'an opening 28 through which the lead wires 12 are brought to make the proper connection,

Having described my invention in detail, I will now describe its operation;

The electrical impulses going through the wires 12 cause the armature to vibrate or rock on its support due to a change of polarity at the pole pieces which is common knowledge in the art. This vibratory motion is imparted to the cente of the supports 16 by the driving rod 15, causing them to flex close to the heads of the screws i in an invaid or outward direction relative to the movement of the armature. The amountof fiexure ofeach of the supports is equal and it is "imparted to the conical support 19 by the extensions or legs 18 in a straight line or reciprocating motion due to their being equi-distant from the center or driving rod 15. The hi h fre uenc of the reel IOCELiLlD motion causes the wall of the cone to vibrate patent statutes, 1 have described my invention, but I desire it understood that it is not confined to the particular form shown and described, the same being merely illustrative, and that the invention can be carried out in other ways without departing from the spirit of my invention, and therefore, I claim broadly the right to employ all equivalent instruinentalities coming within the scope of the appended claims, and by means of which, objects of my invention are attained and new results accomplished; as it is obvious that the particular embodiments herein shown and described are only some of many that can be employed to attain these objects and accomplish these results.

hat I claim, and desire to obtain by Letters Patent is V 1 1. An. acoustic device of the character herein described comprising'a cone-shaped diaphragm, said diaphragm being supported by means of a. resilient member and an annular band which prevents the cone from warping, thereby eliminating distortion.

2. An acoustic device ofthecharacter herein described comprising a cone-shaped diaphragm, a speaker unit. within said diaphragm, a plurality of radiating members on said. speaker unit for securely holding the. V

cone diaphragm at its apex, and reinforced 4 at its apex, and reinforced at its periphery at its periphery by means of a. resilient niemherein described comprising a peripherally reinforced cone-shaped diaphragm, a speaker unit within said diaphragm, a plurality o1 raciating members on said speaker unit for securely holding the cone at its apex, said speaker unit imparting a reciprocating motion to the wall of the cone, the vibratory action'of the wall of the cone being equal at any two or more points equi distant fromits apex, such equal vibratory actionv being insured by means of the reinforced periphery of the cone which prevents it from warping, thereby eliminating distortion, and

thereby producing original sound waves.

This spec fication signed this 42th day of December, 1925.

VVEHRLI D. PACK. 

